Battery pack



FIG. 1 is a top, front and left side perspective view of a battery pack showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof (left side corresponds);

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a battery pack, as shown and described. 